Buggy code:
public class Redirector { private static final String DEFAULT_ENCODING = System . getProperty ( "file.encoding" ) ; private class PropertyOutputStream extends ByteArrayOutputStream { String property ; boolean closed = false ; PropertyOutputStream ( String property ) { } public void close ( ) throws IOException { } } private File [ ] input ; private File [ ] out ; private File [ ] error ; private boolean logError = false ; private Redirector . PropertyOutputStream baos = null ; private Redirector . PropertyOutputStream errorBaos = null ; private String outputProperty ; private String errorProperty ; private String inputString ; private boolean append = false ; private boolean alwaysLog = false ; private boolean createEmptyFiles = true ; private ProjectComponent managingTask ; private OutputStream outputStream = null ; private OutputStream errorStream = null ; private InputStream inputStream = null ; private PrintStream outPrintStream = null ; private PrintStream errorPrintStream = null ; private Vector outputFilterChains ; private Vector errorFilterChains ; private Vector inputFilterChains ; private String outputEncoding = Redirector . DEFAULT_ENCODING ; private String errorEncoding = Redirector . DEFAULT_ENCODING ; private String inputEncoding = Redirector . DEFAULT_ENCODING ; private boolean appendProperties = true ; private ThreadGroup threadGroup = new ThreadGroup ( "redirector" ) ; private boolean logInputString = true ; public Redirector ( Task managingTask ) { } public Redirector ( ProjectComponent managingTask ) { } public void setInput ( File input ) { } public synchronized void setInput ( File [ ] input ) { } public synchronized void setInputString ( String inputString ) { } public void setLogInputString ( boolean logInputString ) { } void setInputStream ( InputStream inputStream ) { } public void setOutput ( File out ) { } public synchronized void setOutput ( File [ ] out ) { } public synchronized void setOutputEncoding ( String outputEncoding ) { } public synchronized void setErrorEncoding ( String errorEncoding ) { } public synchronized void setInputEncoding ( String inputEncoding ) { } public synchronized void setLogError ( boolean logError ) { } public synchronized void setAppendProperties ( boolean appendProperties ) { } public void setError ( File error ) { } public synchronized void setError ( File [ ] error ) { } public synchronized void setOutputProperty ( String outputProperty ) { } public synchronized void setAppend ( boolean append ) { } public synchronized void setAlwaysLog ( boolean alwaysLog ) { } public synchronized void setCreateEmptyFiles ( boolean createEmptyFiles ) { } public synchronized void setErrorProperty ( String errorProperty ) { } public synchronized void setInputFilterChains ( Vector inputFilterChains ) { } public synchronized void setOutputFilterChains ( Vector outputFilterChains ) { } public synchronized void setErrorFilterChains ( Vector errorFilterChains ) { } private void setPropertyFromBAOS ( ByteArrayOutputStream baos , String propertyName ) throws IOException { } public synchronized void createStreams ( ) { } public synchronized ExecuteStreamHandler createHandler ( ) throws BuildException { } protected synchronized void handleOutput ( String output ) { } protected synchronized int handleInput ( byte [ ] buffer , int offset , int length ) throws IOException { } protected synchronized void handleFlush ( String output ) { } protected synchronized void handleErrorOutput ( String output ) { } protected synchronized void handleErrorFlush ( String output ) { } public synchronized OutputStream getOutputStream ( ) { } public synchronized OutputStream getErrorStream ( ) { } public synchronized InputStream getInputStream ( ) { } public synchronized void complete ( ) throws IOException { System . out . flush ( ) ; System . err . flush ( ) ; if ( ( inputStream ) != null ) { inputStream . close ( ) ; } outputStream . flush ( ) ; outputStream . close ( ) ; errorStream . flush ( ) ; errorStream . close ( ) ; while ( ( threadGroup . activeCount ( ) ) > 0 ) { try { managingTask . log ( ( ( "waiting<seq2seq4repair_space>for<seq2seq4repair_space>" + ( threadGroup . activeCount ( ) ) ) + "<seq2seq4repair_space>Threads:" ) , MSG_DEBUG ) ; Thread [ ] thread = new Thread [ threadGroup . activeCount ( ) ] ; threadGroup . enumerate ( thread ) ; for ( int i = 0 ; ( i < ( thread . length ) ) && ( ( thread [ i ] ) != null ) ; i ++ ) { try { managingTask . log ( thread [ i ] . toString ( ) , MSG_DEBUG ) ; } catch ( NullPointerException enPeaEx ) { } } <START_BUG> Thread . sleep ( 1000 ) ; <END_BUG> } catch ( InterruptedException eyeEx ) { } } setProperties ( ) ; inputStream = null ; outputStream = null ; errorStream = null ; outPrintStream = null ; errorPrintStream = null ; } public synchronized void setProperties ( ) { } private OutputStream foldFiles ( File [ ] file , String logHead , int loglevel ) { } }

Fix:
wait ( 1000 ) ;